Search results for: Dongjun Lee

Items from 1 to 20 out of 107 results

article

Supramolecular Engineering of Amorphous Porous Polymers for Rapid Adsorption of Micropollutants and Solar‐Powered Volatile Organic Compounds Management (Adv. Mater. 50/2022)

Wansu Cho, Dongjun Lee, Gyeonghyeon Choi, Jihyo Kim, more

Advanced Materials > 34 > 50 > n/a - n/a

Environmental Remediation In article number 2206982, Chiyoung Park and co‐workers present oxidized covalent triazine frameworks (CTFs) that show exceptional efficiency for removal of phenol derivatives from water and high efficiency for removal of volatile organic compounds via solar‐driven water evaporation. The combination of adsorption and photothermal evaporation using oxidized CTFs offers a cost‐effective...

article

Supramolecular Engineering of Amorphous Porous Polymers for Rapid Adsorption of Micropollutants and Solar‐Powered Volatile Organic Compounds Management

Wansu Cho, Dongjun Lee, Gyeonghyeon Choi, Jihyo Kim, more

Advanced Materials > 34 > 50 > n/a - n/a

Freshwater shortage is becoming one of the most critical global challenges owing to severe water pollution caused by micropollutants and volatile organic compounds (VOCs). However, current purification technology shows slow adsorption of micropollutants and requires an energy‐intensive process for VOCs removal from water. In this study, a highly efficient molecularly engineered covalent triazine framework...

article

Melatonin and verteporfin synergistically suppress the growth and stemness of head and neck squamous cell carcinoma through the regulation of mitochondrial dynamics

Ye Young Shin, Yoojin Seo, Su‐Jeong Oh, Ji‐Su Ahn, more

Journal of Pineal Research > 72 > 1 > n/a - n/a

The prevalence of head and neck squamous cell carcinoma (HNSCC) has continued to rise for decades. However, drug resistance to chemotherapeutics and relapse, mediated by cancer stem cells (CSCs), remains a significant impediment in clinical oncology to achieve successful treatment. Therefore, we focused on analyzing CSCs in HNSCC and demonstrated the effect of melatonin (Mel) and verteporfin (VP)...

article

Artificial Thermal Sensation: Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality (Adv. Funct. Mater. 29/2020)

Jinwoo Lee, Heayoun Sul, Wonha Lee, Kyung Rok Pyun, more

Advanced Functional Materials > 30 > 29 > n/a - n/a

In article number 1909171, Seung Hwan Ko and co‐workers present the development of a skin‐like, highly soft, and stretchable and bi‐functional (both cold and hot sensation) thermo‐haptic device for wearable cutaneous virtual reality applications to reproduce the more realistic and fast thermal sensations on the human epidermis in a virtual world.

article

Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality

Jinwoo Lee, Heayoun Sul, Wonha Lee, Kyung Rok Pyun, more

Advanced Functional Materials > 30 > 29 > n/a - n/a

Along with visual and tactile sensations, thermal sensation by temperature feeling on the skin can provide rich physical information on the environment and objects. With a simple touch of objects, relative temperature can be sensed and even objects can be differentiated with different thermal properties without any visual cue. Thus, artificially reproducing accurate/controllable thermal sensation...

article

In Vivo Profiling of Leukemic Stem Cell Fitness Identifies Therapeutically Actionable Determinants of Growth

Francois Mercier, Jiantao Shi, David Sykes, Toshihiko Oki, more

Experimental Hematology > 2018 > 64 > S > S86

article

Analysis of sensory system aspects of postural stability during quiet standing in adolescent idiopathic scoliosis patients

Taeyong Sim, Hakje Yoo, Dongjun Lee, Seung-Woo Suh, more

Journal of NeuroEngineering and Rehabilitation > 2018 > 15 > 1 > 1-11

Background The aim of this study was to quantitatively analyze quite standing postural stability of adolescent idiopathic scoliosis (AIS) patients in respect to three sensory systems (visual, vestibular, and somatosensory). Method In this study, we analyzed the anterior-posterior center of pressure (CoP) signal using discrete wavelet transform (DWT) between AIS patients (n = 32) and normal controls...

article

Role of autotaxin in cancer stem cells

Dongjun Lee, Dong-Soo Suh, Sue Chin Lee, Gabor J. Tigyi, more

Cancer and Metastasis Reviews > 2018 > 37 > 2-3 > 509-518

Stem cells are a rare subpopulation defined by the potential to self-renew and differentiate into specific cell types. A population of stem-like cells has been reported to possess the ability of self-renewal, invasion, metastasis, and engraftment of distant tissues. This unique cell subpopulation has been designated as cancer stem cells (CSC). CSC were first identified in leukemia, and the contributions...

article

Teleoperation of a platoon of distributed wheeled mobile robots with predictive display

Changsu Ha, Jaemin Yoon, Changu Kim, Yonghan Lee, more

Autonomous Robots > 2018 > 42 > 8 > 1819-1836

We propose a novel teleoperation framework for multiple distributed non-holonomic mobile robots (WMR), each equipped with onboard sensing and computing using peer-to-peer communication. One of the WMRs is designated as the leader with the first-person view camera and SLAM, while the other WMRs maintain a certain desired formation relative to their respective fore-running WMR in a distributed manner...

chapter

Passivity-based control of manipulator-stage systems on vertical flexible beam

Changsu Ha, Hackchan Kim, Dongjun Lee

2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) > 429 - 435

2017 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

We develop a novel passivity-based control framework of a manipulator-stage system sitting on a vertical flexible beam. We first model the vertical flexible beam by using Euler-Bernoulli theory and modal approximation while utilizing certain boundary conditions to take into account the effect of the gravity and interaction wrench between the manipulator-stage system and the beam. To separately achieve...

article

Positioning control of an underwater robot with tilting thrusters via decomposition of thrust vector

Jeongae Bak, Hai-Nguyen Nguyen, Sangyul Park, Dongjun Lee, more

International Journal of Control, Automation and Systems > 2017 > 15 > 5 > 2283-2291

Positioning control of an underwater robot is a challenging problem due to the high disturbances of ocean flow. To overcome the high disturbance, a new underwater robot with tilting thrusters was proposed previously, which can compensate for disturbance by focusing the thrusting force in the direction of the disturbance. However, the tilting motion of the thrusters makes the system nonlinear, and...

article

Effects of cooling rate and stabilization annealing on fatigue behavior of β-processed Ti-6Al-4V alloys

Wongyu Seo, Daeho Jeong, Dongjun Lee, Hyokyung Sung, more

Metals and Materials International > 2017 > 23 > 4 > 648-659

The effects of stabilization annealing and cooling rate on high cycle fatigue (HCF) and fatigue crack propagation (FCP) behaviors of β-processed Ti64 alloys were examined. After β-process heating above β transus, two different cooling rates of air cooling (β-annealing) and water quenching (β-quenching) were utilized. Selected specimens were then underwent stabilization annealing. The tensile tests,...

chapter

Fast ZMP and friction force calculation of mobile robot trajectory on uneven trajectory

Hyunsoo Yang, Sang-Yun Jeon, Dongjun Lee

2017 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI) > 884 - 885

2017 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

In this paper, we develop a zero-moment-point and friction force calculation framework for wheeled mobile robots on uneven terrain to evaluate roll-over and slippage tendency of the given trajectory. The proposed framework using dynamic constraints and passive decomposition has advantages of low computations and implementation cost. Simulation results using CarSim is provided to analyze the performance...

chapter

Experimental evaluation of passivity-based control of manipulator-stage system on flexible beam

Changsu Ha, Hackchan Kim, Dongjun Lee

2017 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI) > 465 - 466

2017 14th International Conference on Ubiquitous Robots and Ambient Intelligence (URAI)

In this paper, we consider the modeling and control problem of the stage-manipulator system on the vertical flexible beam and provide experiment results of the proposed passivity-based control framework which separately achieves two control objectives, i.e. the end-effector (EF) tracking and vibration suppression. For this, we first utilize the passive decomposition to split the dynamics into: 1)...

chapter

On the passivity of mechanical integrators in haptic rendering

Myungsin Kim, Juhyeok Kim, Yongjun Lee, Dongjun Lee

2017 IEEE International Conference on Robotics and Automation (ICRA) > 446 - 452

2017 IEEE International Conference on Robotics and Automation (ICRA)

We propose a novel haptic rendering scheme based on passive midpoint integrator (PMI), which is an extension of our prior non-iterative passive mechanical integrator (NPMI) to maximal coordinates for simulation of complex articulated rigid bodies and to multi-point intermittent contact with the linear complementarity problem (LCP) formulation incorporated. The proposed PMI-based haptic rendering then...

article

Passive Configuration Decomposition and Passivity-Based Control of Nonholonomic Mechanical Systems

Dongjun Lee, Kent Yee Lui

IEEE Transactions on Robotics > 2017 > 33 > 2 > 281 - 297

We propose a novel passivity-based stabilization control framework for a certain class of nonholonomic mechanical systems. First, we derive the notion of passive configuration decomposition, which enables us to configuration-level decompose the system's Lagrange–D’Alembert dynamics into two systems, each evolving on their respective configuration spaces and also individually inheriting Lagrangian...

article

Multi-rotor drone tutorial: systems, mechanics, control and state estimation

Hyunsoo Yang, Yongseok Lee, Sang-Yun Jeon, Dongjun Lee

Intelligent Service Robotics > 2017 > 10 > 2 > 79-93

We present a tutorial introduction to the multi-rotor unmanned aerial vehicles, often simply referred as drones. We first explain typical configuration, components and construction of the drones. We then provide basic kinematic and dynamic modeling of drones and their principle of flight. Some representative motion control techniques are then presented, which take into account the issue of under-actuation...

article

Effective R&D investment planning based on technology spillovers: the case of Korea

Jungkyu Park, Eunnyeong Heo, Dongjun Lee

Scientometrics > 2017 > 111 > 1 > 67-82

This study was performed to discuss an R&D investment planning method based on the technology spillover among R&D fields, from the point of view of technology convergence. The empirical analysis focused on a particular R&D group, such as university departments and specialized research institutes, since local technology combinations are more effective than distant combinations to create...

article

Robust consensus of linear systems on directed graph with non-uniform delay

Dongjun Lee

IET Control Theory & Applications > 2016 > 10 > 18 > 2574 - 2579

The authors propose a consensus control framework for multiple heterogeneous general single-input single-output linear systems with no zeros at s = 0 on a directed information graph with constant, yet, non-uniform and unknown delays. The proposed consensus control is easy to design via loop-shaping like graphical approach, robust against plant uncertainty and constant delay, and completely decentralisable...

article

Proximity-Based Differential Single-Cell Analysis of the Niche to Identify Stem/Progenitor Cell Regulators

Lev Silberstein, Kevin A. Goncalves, Peter V. Kharchenko, Raphael Turcotte, more

Cell Stem Cell > 2016 > 19 > 4 > 530-543

Physiological stem cell function is regulated by secreted factors produced by niche cells. In this study, we describe an unbiased approach based on the differential single-cell gene expression analysis of mesenchymal osteolineage cells close to, and further removed from, hematopoietic stem/progenitor cells (HSPCs) to identify candidate niche factors. Mesenchymal cells displayed distinct molecular...

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INFONA - science communication portal

Search results for: Dongjun Lee

Supramolecular Engineering of Amorphous Porous Polymers for Rapid Adsorption of Micropollutants and Solar‐Powered Volatile Organic Compounds Management (Adv. Mater. 50/2022)

Supramolecular Engineering of Amorphous Porous Polymers for Rapid Adsorption of Micropollutants and Solar‐Powered Volatile Organic Compounds Management

Melatonin and verteporfin synergistically suppress the growth and stemness of head and neck squamous cell carcinoma through the regulation of mitochondrial dynamics

Artificial Thermal Sensation: Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality (Adv. Funct. Mater. 29/2020)

Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality

In Vivo Profiling of Leukemic Stem Cell Fitness Identifies Therapeutically Actionable Determinants of Growth

Analysis of sensory system aspects of postural stability during quiet standing in adolescent idiopathic scoliosis patients

Role of autotaxin in cancer stem cells

Teleoperation of a platoon of distributed wheeled mobile robots with predictive display

Passivity-based control of manipulator-stage systems on vertical flexible beam

Positioning control of an underwater robot with tilting thrusters via decomposition of thrust vector

Effects of cooling rate and stabilization annealing on fatigue behavior of β-processed Ti-6Al-4V alloys

Fast ZMP and friction force calculation of mobile robot trajectory on uneven trajectory

Experimental evaluation of passivity-based control of manipulator-stage system on flexible beam

On the passivity of mechanical integrators in haptic rendering

Passive Configuration Decomposition and Passivity-Based Control of Nonholonomic Mechanical Systems

Multi-rotor drone tutorial: systems, mechanics, control and state estimation

Effective R&D investment planning based on technology spillovers: the case of Korea

Robust consensus of linear systems on directed graph with non-uniform delay

Proximity-Based Differential Single-Cell Analysis of the Niche to Identify Stem/Progenitor Cell Regulators

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